This PR includes:
1) Add new data type Timestamp
2) Add more data type casting base on Hive's Rule
3) Fix bug missing data type in both parsers (HiveQl & SQLParser).

Author: Cheng Hao <hao.cheng@intel.com>

Closes #275 from chenghao-intel/timestamp and squashes the following commits:

df709e5 [Cheng Hao] Move orc_ends_with_nulls to blacklist
24b04b0 [Cheng Hao] Put 3 cases into the black lists(describe_pretty,describe_syntax,lateral_view_outer)
fc512c2 [Cheng Hao] remove the unnecessary data type equality check in data casting
d0d1919 [Cheng Hao] Add more data type for scala reflection
3259808 [Cheng Hao] Add the new Golden files
3823b97 [Cheng Hao] Update the UnitTest cases & add timestamp type for HiveQL
54a0489 [Cheng Hao] fix bug mapping to 0 (which is supposed to be null) when NumberFormatException occurs
9cb505c [Cheng Hao] Fix issues according to PR comments
e529168 [Cheng Hao] Fix bug of converting from String
6fc8100 [Cheng Hao] Update Unit Test & CodeStyle
8a1d4d6 [Cheng Hao] Add DataType for SqlParser
ce4385e [Cheng Hao] Add TimestampType Support